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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../container/span/as_bytes.html below:

Obtains a view to the object representation of the elements of the span s.

If N is std::dynamic_extent, the extent of the returned span S is also std::dynamic_extent; otherwise it is sizeof(T) * N.

as_writable_bytes only participates in overload resolution if std::is_const_v<T> is false.

[edit] Return value 1)

A span constructed with

{reinterpret_cast<const std::byte*>(s.data()), s.size_bytes()}

2)

A span constructed with

{reinterpret_cast<std::byte*>(s.data()), s.size_bytes()}

[edit] Example

Possible output:

 3.14159 = { D8 0F 49 40 }
-3.14159 = { D8 0F 49 C0 }

[edit] See also

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